Basic knowledge of magnesia brick

Magnesia brick is an alkaline refractory material with a magnesium oxide content of more than 90% and periclase as the main crystal phase. Generally, it can be divided into two categories: sintered magnesia bricks (also known as fired magnesia bricks) and chemically combined magnesia bricks (also known as unburned magnesia bricks). Magnesia bricks with high purity and firing temperature are called direct-bonded magnesia bricks due to the direct contact of periclase grains; bricks made of fused magnesia as raw materials are called fused re-bonded magnesia bricks, which are suitable for various Rotary kiln, sleeve kiln, shaft kiln and other large and medium lime kilns. Magnesia brick has the advantages of strong alkali erosion resistance, strong erosion resistance, good thermal stability, high compressive strength, and high softening temperature under load. The fired magnesia brick uses high-quality sintered magnesia as the main raw material and pulp as the binder. After kneading and high pressure molding, it is fired in a high temperature tunnel kiln above 1550°C. Has good thermal stability, corrosion resistance and peeling resistance. It is widely used in industrial kilns such as converters and electric arc furnaces as lining refractories. magnesia brick

Fused magnesia bricks have the advantages of dense brick structure, high mechanical strength, and low impurity content. They are mainly used for heat storage and dense refractory bricks in large glass kilns. There are refractory materials of shape and size, and the unit volume weight and density are large, indicating compactness. Well, the strength may be high, also called the high temperature load deformation temperature, called the reburning line change or the residual line change, which refers to the change in volume expansion and contraction in the same temperature change, about 1800 degrees, the softening temperature under load is in 1620-1640, the thermal expansion coefficient is small.

Dense refractory brick is a kind of siliceous clay in hydrated aluminum silicate.

The ability to not soften and not paste, refractory bricks in the amorphous material sector, there are a variety of product consumption, the basic quality requirements are alumina higher than 38% and low iron and low alkali metal content, these products can be uncalcined or calcined , such as refractory clay, plastic material for overload, high alumina plastic, refractory clay and high alumina castable, etc.

Unburned alumina-ma-gnesia brick for ladle refers to unburned refractory products made of bauxite clinker and magnesia as raw materials for ladle lining bricks. With the development of new steelmaking technologies such as converter oxygen blowing, continuous casting and out-of-furnace refining, the increase of molten steel temperature and the prolongation of residence time in the ladle make the use conditions of the ladle lining harsh, resulting in clay-lined bricks. The erosion is serious, and the use of this kind of lining brick has a better effect. The non-burning refractory products used for ladle lining bricks. With the development of new steelmaking technologies such as converter oxygen blowing, continuous casting and out-of-furnace refining, the increase of molten steel temperature and the prolongation of residence time in the ladle make the use conditions of the ladle lining harsh, resulting in clay-lined bricks. The erosion is serious, and the use of this kind of lining brick has a better effect